删除文本框中的字符

我正在尝试配置TextBox，以便在按ctrl+delete键时可以清除TextBox。

这是我的整个代码：

using System;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Windows.Forms;

namespace pruebaMensajes
{
    public partial class Providus : Form{
        public Providus(){
            InitializeComponent();
            txtUsuario.MaxLength = 20;//max character
            txtContrasena.MaxLength = 16;
            txtContrasena.PasswordChar = '*';//type
        }

        private void Button1_Click(object sender, EventArgs e){//para el login
            string usuario = txtUsuario.Text;
            string contrasena = txtContrasena.Text;
            SqlConnection con = new SqlConnection("stringChain");
            SqlDataAdapter sda = new SqlDataAdapter("SELECT COUNT(*) FROM usuariosProvidus WHERE usuario='" + usuario + "' AND contrasena='" + contrasena + "'", con);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            if (dt.Rows[0][0].ToString() == "1"){
                this.Hide();
                new Inicio().Show();
            } else{
                MessageBox.Show("Wrong user o password.","Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void Providus_Load(object sender, EventArgs e){ }

        private void TxtContrasena_KeyPress_1(object sender, KeyPressEventArgs e){//manejar el enter para el login en contraseña
            if ((int)e.KeyChar == (int)Keys.Enter){
                string usuario = txtUsuario.Text;
                string contrasena = txtContrasena.Text;
                SqlConnection con = new SqlConnection("Data Source=PC-HELP;Initial Catalog=apiTiny;Integrated Security=True");
                SqlDataAdapter sda = new SqlDataAdapter("SELECT COUNT(*) FROM usuariosProvidus WHERE usuario='" + usuario + "' AND contrasena='" + contrasena + "'", con);
                DataTable dt = new DataTable();
                sda.Fill(dt);
                if (dt.Rows[0][0].ToString() == "1"){
                    this.Hide();
                    new Inicio().Show();
                }else if(txtUsuario.Text==String.Empty){
                    lblMensaje.BackColor = Color.FromArgb(255, 0, 0);
                    lblMensaje.Text = "Wrong user.";
                    txtUsuario.Focus();
                }else if (txtContrasena.Text == String.Empty){
                    lblMensaje.BackColor = Color.FromArgb(255, 0, 0);
                    lblMensaje.Text = "Wrong password.";
                    txtContrasena.Focus();
                }
            }
        }

        private void TxtUsuario_KeyPress(object sender, KeyPressEventArgs e){//enter para el txt usuario
            if ((int)e.KeyChar == (int)Keys.Enter){
                string usuario = txtUsuario.Text;
                string contrasena = txtContrasena.Text;
                SqlConnection con = new SqlConnection("Data Source=PC-HELP;Initial Catalog=apiTiny;Integrated Security=True");
                SqlDataAdapter sda = new SqlDataAdapter("SELECT COUNT(*) FROM usuariosProvidus WHERE usuario='" + usuario + "' AND contrasena='" + contrasena + "'", con);
                DataTable dt = new DataTable();
                sda.Fill(dt);
                if (dt.Rows[0][0].ToString() == "1"){
                    this.Hide();
                    new Inicio().Show();
                }
                else if (txtUsuario.Text == String.Empty){
                    lblMensaje.BackColor = Color.FromArgb(255, 0, 0);
                    lblMensaje.Text = "Worng user.";
                    txtUsuario.Focus();
                }
                else if (txtContrasena.Text == String.Empty){
                    lblMensaje.BackColor = Color.FromArgb(255, 0, 0);
                    lblMensaje.Text = "Worng password.";
                    txtContrasena.Focus();
                }
            };
        }

        private void TxtUsuario_KeyDown(object sender, KeyEventArgs e){
            if (e.KeyCode == Keys.Delete && e.Modifiers == Keys.ControlKey){
                e.Handled = true;
                txtUsuario.Text = "";
            }
        }

        private void TxtContrasena_KeyDown(object sender, KeyEventArgs e){
            if (e.KeyCode == Keys.Delete && e.Modifiers == Keys.Control){
                e.Handled = true;
                txtContrasena.Text = "";
            }
        }
    }
}

有人知道我该怎么做吗？原因是当我按下按键时ctrl+delete这会添加一个字符而不是清除文本框。我使用keydown事件来实现这一点，但它对我不起作用

在gif中：